我是新来的,只是学习而已。我有一个python中的ANN,我正在Theano中实现作为学习过程。我在用Spyder。在
然后Theano抛出一个错误:TypeError:Unknown parameter type:class'努比·恩达雷'
我不知道错误在哪里。是在成本函数中还是在梯度下降中?这其中的典型原因是什么?在
这是我的代码:
X = T.dmatrix()
y = T.dmatrix()
X_input = np.genfromtxt('X.csv',delimiter=',') #5000x195
y_input = np.genfromtxt('y.csv',delimiter=',') #5000x75
input_layer_size, hidden_layer_size_1, hidden_layer_size_2, y_size = 195, 15, 15, 75
theta1 = theano.shared(np.array(np.random.rand(hidden_layer_size_1, (input_layer_size+1)), dtype=theano.config.floatX))
theta2 = theano.shared(np.array(np.random.rand(hidden_layer_size_2, (hidden_layer_size_1+1)), dtype=theano.config.floatX))
theta3 = theano.shared(np.array(np.random.rand(y_size, hidden_layer_size_2+1), dtype=theano.config.floatX))
def computeCost(X, y, w1, w2, w3):
m = X.shape[0]
b = T.ones((m,1))
a_1 = T.concatenate([b, X], axis=1)
z_2 = T.dot(a_1, T.transpose(w1))
a_2 = T.nnet.nnet.sigmoid(z_2)
a_2 = T.concatenate([b, a_2], axis=1)
z_3 = T.dot(a_2, T.transpose(w2))
a_3 = T.nnet.nnet.sigmoid(z_3)
a_3 = T.concatenate([b, a_3], axis=1)
z_4 = T.dot(a_3, T.transpose(w3))
h = T.nnet.nnet.sigmoid(z_4)
cost = T.sum(-y * T.log(h) - (1-y) * T.log(1-h))/m
return cost
fc = computeCost(X, y, theta1, theta2, theta3)
def grad_desc(cost, theta):
alpha = 0.1 #learning rate
return theta - (alpha * T.grad(cost, wrt=theta))
cost = theano.function(inputs=[X_input, y_input], outputs=fc, updates=[
(theta1, grad_desc(fc, theta1)),
(theta2, grad_desc(fc, theta2)),
(theta3, grad_desc(fc, theta3))])
我的上一个代码生成了此错误:
^{pr2}$
在您的
theano.function
中,您的输入是numpy数组(X\u输入和y\u输入)。您希望输入是符号变量,例如:这将创建一个可以用numpy数组调用的函数来执行实际计算,如:
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